System and apparatus for handling paper for printing machines



Nov. 8, 1938. STUART ET AL 2,135,541

SYSTEM AND APPARATUS FOR HANDLING PAPER FOR PRINTING MACHINES 8Sheets-Sheet l VENT " NEY.

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SYSTEM AND APPARATUS FOR, HANDLING PAPER FOR PRINTING MACHINES FiledAug. 15, 1955 8 Shets-Sheet 2 ll'll ORN ' Nov. 8, 1938. R. STUART ET AL2,135,541

SYSTEM AND APPARATUS FOR.HANDLING PAPER FOR PRINTING MACHINES Filed Aug.15, 1935 .8 Sheets-Sheet 3 Nov. 8 1938. R. STUART ET AL SYSTEM ANDAPPARATUS FOR HANDLING PAPER FOR PRINTING MACHINES 8 Sheets-Sheet 4Filed Aug. 15. 1935 Nov. 8, 1938. R. STUART ET AL 2,135,541

SYSTEM AND APPARATUS FOR HANDLING PAPER- FOR PRINTING MACHINES FiledAug. 15, 1935 s Sheets-Sheet 5 61 \Nm, W mwfw wl. vw u T N 0 T 1% A lNov. 8, 1938. R. STUART ET AL 2,135,541

SYSTEM AND APPARATUS FOR HANDLING PAPER FOR PRINTING MACHINES Filed Aug.15, 1955 8 Sheets-Sheet 6 MQN mam lllllIlH IlIlll lLl Nov. 8, 1938.RSTUA T' ET A A 2,135,541

SYSTEM AND APPARATUS FOR HANDLING PAPER FOR PRINTING MACHINES Filed Aug.15, 1955 s sheets-sheet 7' ATTORN Nov. 8, 19 38. R. STUART ET AL2,135,541

SYSTEM AND APPARATUS FOR HANDLING PAPER FOR PRINTING MACHINES Filed Aug.15, 1955 8 Sheets-Sheet 8 Patented Nov. 8, 19 38 SYSTEM AND APPARATUSFOR HANDLING PAPER FOR PRINTING MACHINES Robert Stuart, Forest Hills, N.Y., and Matthew H. Loughridge, Bogota, N. J. Application August 15,1935, Serial No. 36,392

. 77 Claims.

This invention relates to a system and the apparatus used in connectiontherewith, for taking up, aligning, and delivering paper sheets toaprinting machine and it is shown in connection with the common form oftypewriter. The paper is automatically located ,in the correct writingposition and after a predetermined. number of lines have been written itis automatically removed from the machine and conveyed to a tray and afresh sheet of paper is supplied for repeat ing the operation. Thesystem further contemplates the control of the paper feed in such amanner that the paper may be located for writing purposes in a pluralityof positions in which any number of lines, with any line spacing, may beused for writing in each position. After the writing operation iscompleted the paper is automatically removed from the machine and a'newwriting sheet located for repeating the operation. One purpose of thesystem is to address envelopes supplied automatically from a tray. Whenthe predetermined number of lines for the address is written, themachine completes the cycle of operation by removing the envelope thathas been addressed and supplying a new envelope in its place for anotheraddress. Another use of the system is to fill-in the headings ofcircular letters and, if required, to fill-in specific data in the bodyof the letter for each cycle of operation. Another use for the system isto sup ply, the name and address and the charges on billing forms.-Other uses of a similar character are readily supplied by the system. inwhich the main purpose is to eliminate the manual handling of the paperto and from the writing machine and .to limit the manual operation tothe writing itself.

In the application of this system, a mechanism is provided for liftingthe paper tobe written 40 upon, one sheet at a time, from a'tray, andthis mechanism cooperates with a conveyor which carries the sheetforward to a feed roller where it is aligned and held in readiness to bedelivcred to the platen roller. At the proper time in the cycle ofoperation the feed roller delivers the paper sheet to the platen rollerwhich is revolved to a predetermined extent to position the paper in thecorrect writing position; At this point the automatic operation ceasesuntil the predetermined number of lines have been written on the sheetin the usual manner by the typewriter keyboard. If another writingposition'is required on the same sheet, the platen is then automaticallyrotated until the new writing position is reached and after apredetermined number of lines have been written, the sheet may be movedto another writing position by a further rotation of the platen, or thesystem may be adjusted to discharge the sheet from the platen as soon asany of the writing operations have been completed. A see '6 0nd conveyorcarries the discharged sheet forward from the platen and delivers itinto a storage tray. In the form selected to illustrate the system thevarious controls are carried out electrlcally, the apparatus operatesentirely independently of the typewriter machine and may be used withany of the common forms of type! writer. The only connection between thetypewriter and theapparatus is the connection for rotating the platen.15

The apparatus used for carrying out the various functions of the systemembodies certain novel features, most of which are of generalapplication in the printing art and each of these features may be usedalone, or in combination with the other features orvwith other systemsof paper feed.

The paper lift comprises a roller mounted above the paper tray, on aswingingframe, which enables the roller to adjust itself automaticallyfi to the height of the paper in the tray. This" roller is "beltconnected with the conveyor system and is normally held clear of thepaper except when a sheet is to be taken out. For this purpose a pair ofvacuum cups are provided on the roller, 30 v sheet to the feed roller.The feed roller is provided with a longitudinal iedge, which, in thenormal position, engages the end of the sheet as it comes 'from'theconveyor and as this roller is rotated a cam portion of its 40 surfaceis brought into action to carry the paper sheet forward to the platen ofthe writing machine. 'In order to insure that the paper sheet isproperly aligned on the ledge of the feed roller,

the platen'to a predetermined extent to locate 55 the paper in the firstwriting position. In this position the number of lines that are to'bewritten are known and a stepping mechanism, operated by the carriage ofthe typewriter, when the number of lines have been completed and thecarriage is restored to the starting position, sets up the condition forthe next movement of the platen. If this condition requires a secondwriting position on the paper, the platen is automatically rotated tolocate the paper in this writing position and, after the required numberof lines are written in this second location, the stepping mechanismoperated by the carriage then establishes the conditions for dischargingthe paper completing the cycle of operation and restoring the apparatusto the normal or starting position.

In the final operation of the platen, which discharges the paper, thelift roller is operated therewith to lift a new sheet and place it onthe conveyor and the feed roller is moved to the normal position toarrest and align this sheet of paper. In the operation, as shown in thedrawings, the platen is designed to make three complete turns for onecycle of operation, the printing'positions of the platen may take one ormore .turns and the final operation completes the balance of therevolution of the platen until three complete turns have been made andthe system is restored to the starting position. In each cycle ofoperation the feedroller is controlled to make one-half turn with thefirst movement of the platen and to complete a single rotation with thefinal movement of the platen and the lift roller makes one revolutionfor each cycle of operation.

In the control of the system the sequence of operation of the variousparts is obtained by a progressive control of the following movement bythe movement of the preceding apparatus and the extent of the movementis controlled by the part itself. In the electric control, movementscannot be prematurely obtained nor can a movement be had out of itssequence in the operation of the system.

The apparatus by whichthese and other features are accomplished-and themode of operation will be more fully understood from thefollowingspecification and the accompanying drawings, in which Fig. 1 is a sideelevation of the machine applied to a typewriter, showing the supportingframe and the general mechanism;

Fig. ,2 is a plan view of the machine from the top, showing the topconveyor only;

Fig. 3 is a plan view, partly sectioned, showing the mechanism forautomatically rotating the platen;

Fig. 4 is a stepping wheel and operating mechanism for registering thenumber of lines that have been written;

Fig. 5 is a section on line 5-5 of Fig. 3;

i Fig. 6 is a section on line 6-4 of Fig. 3;

Fig. 7 is a vertical section on line 1-1 of Fig. 3;

Fig. 8 is a side elevation, partly sectioned, of the feed roller, platenand paper guides;

Fig. 9 is another side elevation, partly sectioned, of the feed rollerin another position, and the platen;

Fig. 10 is a detail of the mechanism associated with the feed roller;

Fig. 13 is a plan view corresponding to Fig. 12;

Fig. 14 is an elevation of the take-up roller, partly sectioned, showingthe application of the Venturi suction tubes;

Fig. 15 is a detail of the air control system on line l5, Fi 14;

Fig. 16 is an alternative form, shown in elevation, of the take-uproller, using rubber vacuum cups;

Fig. 17 is a plan view of a paper tray provided with a light valve forcontrolling the elevation of the tray as the paper is removed; 7

Fig. 18 is an elevation of the mechanism in Fig. 17, including theapparatus for elevating the tray;

Fig. 19 shows another form of the invention in which the platen rolleris driven by a friction roller which is operated by the drivingmechanism;

Fig. 20 is a plan view of the mechanism for operating the stop fingersand the gripping rollers in connection with Fig. 19;

Fig. 21 is a side elevation, in diagram form, showing the relation ofthe friction roller to the platen roller and the stop fingers forcontrolling the paper feed;

Fig. 22 is a diagram of the operating circuits, and

Fig. 23 is -a cross section of the adjustable circuit controller forcontrolling the position of the sheet on the platen.

General arrangement of apparatus In Fig. 1, ll represents a table orstand upon which the apparatus is placed, i2 is the typewriting machinehaving the platen l3 mounted in the usual carriage l4 which slides tothe left as the writing progresses as indicated at i5. i6 is the drivingmechanism which is coupled to the platen roller 13 and is connected by aflexible drive I! with the motor i 8.

The conveyors and the paper take-up are supported by the frame member l9to which the member 20 is adjustably clamped for adjusting the height ofthe mechanism. The frame 2i of the lower conveyor is secured to thesupporting tor i8, through a suitable reduction gear, drives the beltwheel 30, which by belt 3|, and belt wheel 32, drives the main shaft 33.This shaft through belt 34 drives the conveyor belts 40 and II of theupper conveyor and through roller I53, Fig. 13, drives the conveyor beltI11 leading to the feed roller 26. p

Aframe 36 is pivoted on shaft 33 and carries I at its outer end. papertake-up roller or drum 31,

which is mounted above the stack of paper 38 in the tray 39 which isfixedly supported on the table I i. As the paper is removed from thestack, I

take-up roller '31, through the pivoted arm 38, follows the paper. Theconveyors are shown. in the drawings as of the usual type made of aplurality of bands but they may-be made from a 'single belt or inotherwell knownforms.

The automatic drive for platen The mechanism for rotating the platenposition the paper in one or more writing positions and finally todischarge the paper from the machine is illustrated in Figs. 3, 5, 6 and7. The shaft 50 of the platen I3 is coupled at 5| with. the splinedshaft 52 which passes through the housing 54 of the mechanism. Thishousing is supported by a vertical plate 53 which has a base 53a. torest upon a fixed support and-the mechanism is clamped thereto by thehook bolts 56 and nuts 55. An aperture 51 is provided in plate 53considerably larger than shaft 52 so that the mechanism may be clampedin place, properly aligned with shaft 50.

The flexible drive l1 connects to the worm 59 which engages the wormwheel 58, mounted on shaft on which shaft the gear 8|, Fig. 5, ismounted. Gear 6i engages gear 52, mounted on shaft 53, and it alsoengages gear 54, mounted on shaft 65, so tha when the motor I8 isrunning the shafts 53 an are continuously rotating. Mounted on ,theshaft 83, Fig. 6, is the gear 56 which engages gear 61, splined on shaft52, which shaft is coupled to platen 13; also on shaft 65 the gear 68 ismounted which likewise engages gear 61, splined on shaft 52, thusrotating either gear 65 or gear 58 will rotate the platen. Gear 66' isconnected with shaft 63 by' an electrically controlled friction clutch69 and gear 58 is similarly connected with shaft 65 by clutch H.

The friction clutch59, Fig. 7, when moved to the left, engages theclutch member 10, and. 69 being splined on shaft 53, it thereby causesgear 66 to rotate with gear 52. This clutch is operated by the armaturelever 14, pivoted at 15, and held in the released position by spring 16,which is opposed by magnet 1-3, so that when 13 .is energized, theclutch is brought into engagement and when 13 is deenergized-the clutchis immediately disengaged. A corresponding mechanism is used on shaft 65in which .the clutch H is brought into engagement with clutch member 12to rotate gears 54 and 68 together on shaft 65. The clutch H is operatedby armature lever 18, pivoted at 19, and controlled by magnet 11 in amanner similar to the clutch 69.

The gear ratio between the drive shaft 60 and the driven shaft 52 islower when the clutch 59 is engaged than when the clutch H is engaged,with the result that when magnet 13 is energized,

and which corresponds to the condition in which the paper is located inthe writing position, the platen is rotated at a lower speed, due to thedifference in the size of the gears, than when magnet 11 is energizedand which corresponds with the condition in which the paper isdischarged from the platen. The high speed in which the paper isdischarged from the machine projects it forward onto the conveyor andenables the conveyor" to be spaced a distance from the platen that willpermit the use of the longest commercial sheets of paper without havingtheupper ends of these sheets engaging the conveyor at any writingposition. At the same time, short sheets are projected forward by thehigh speed of the platen to engage the conveyor.

' Control of platen The machine is intended-to operate on-long sheets ofpaper as well as on short forms and envelopes. To position the paper onthe platen may require more-than oneturn of the platen and to ultimatelydischarge the paper from the platen may require more than two turns ofthe 6, in which the ring 8! is geared to the wheel 81 and is mounted torotate on the stationary disc 83 which is secured by the hollow nut 84to the upstanding head 85 of the frame member 54. The ring 8! is held inplace by the cleat .82 and 5 carries the contacting band 86 whichcontrols the circuit of magnet 11. This ring or band is provided withthe dead or insulated section 81 which marks the beginning of a cycle ofopera-g tion. It will be noted that as the shaft 52 is rotated the ring8| is also rotated and it requires three turns of gear 6-1 to completeone turn of the ring 8| or one cycle. of operation. The hollow nut- 84enables the electrical conductors, whose circuit is controlled by 86, topass through this nut. I

The electrical control of magnet 13 is obtained by the disc 90 and'thedisc 88 mounted thereon and rotated by shaft 52 through a frictionalengagement thereof so that these discs can be positioned to controlmagnet 13 through the contact fingers 89, 9|, at any position of theplaten desired, as more fully described in connection with the operatingcircuits, Figs. 22 and 23.

Mounted on the outer end of the shaft 52, Fig. 4, is an adjustablypositioned bracket 02, carrying the detent 93 which engages the steppingv wheel 94, mounted at on the bracket 05 which is secured to thesupporting plate 53. A spring pressed roller 91 engages the teeth'of 84to hold it in position. Each movement of the typewriter carriage to theright, which is preliminary to starting a new line, moves the steppingwheel 94 one step for setting up a control as defined in 1 the operatingcircuits for either changing the 35 platen to move the paper to a .newwriting position or for completing the cycle of operation bydischargingthe sheet of paper from the machine. It will be noted'that the splinedshaft 52 is the only part which is mechanically connected with thetypewriter and in order to apply the mechanism to existing machines, thesplined shaft 52 slides through the mechanism. It is obvious that if aspecial platen is provided the spline, could be located in the platenroller itself.

The feed roller In Fig. 9, the type bar is indicated at l0l engaging theplaten roller l3 in the writing position, this roller is provided withthe usual paper guide I02 and the spring pressed roller I03, mounted onthe paper table I04 for conducting the paper sheet I05 into the writingposition. Thepaper sheet 005 is brought forward by the conveyor belt I06and is directed by the paper guide I01 to the ledge I08 of the feedroller 20. This ledge extends longitudina1ly of the roller and formsa-stop for the entering edge of the paper sheet and upon which the papersheet is aligned. The feed'roller 26 has a raised or cam surface I09which as the roller rotates in the direction of the arrow, clamps thepaper sheet I05 between this roller and the spring pressed roller illand thus urges the sheet forward to engage the platen duringapproximately one-half revolution of roller 26, representing the surfaceof cam I09. -As soon as the paper sheetis engaged between the platen l3and the roller I03 the paper is released by roller 26 owing to thedepressed part of the roller indicated at 0, registering with roller IIIas indicated in Fig. 9. It will be noted in this figure that the paperI05, now in writing position on the platen, is free of. the feed roller28 and the longitudinal movement of the platen l3 with the carriage, andthe paper I05, is not interfered with by the feed roller 26. The paperdischarged from the platen is projected between the guides H2 and H3 andbelow the spring pressed roller H5 onto the upper conveyor H4 from whichit is conveyed to the tray 28. If the nature of the paper to be writtenupon requires the immediate engagement of the roller III with the camI09 when the ledge I08 is cleared, a cam arrangement as shown in Fig. 10may be provided to secure this result. In this construction the supportof the roller III is extended and connected with the arm H9 which isprovided with the slot through which the axis of the roller 26 passesand this roller has a cam H6, with a rise H1, which engages the rollerH8 of the arm H8 and which is arranged to pull the roller: I II intoengagement with cam I09 at the proper time.

Aligning the paper sheet In order to insure that the paper sheet I05 isproperly aligned with the mechanism, a detector arrangement is providedas shown in Fig. 11, and which comprises the light bulb I24, placed inline with the diametrical opening I23 in the feed roller and so arrangedthat when the sheet of paper I05 is absent a light from the bulb shinesdirectly upon the photo-electric cell I25 and thereby establishes acircuit to indicate this condition, the application of which isdescribed in the operating circuits. The system contemplates a pair ofdetector circuits, one operating through the hole of I22 and the otheroperating through the hole I23 in Fig. 3. These holes are spaced apartto correspond with the outer edge of the paper and the control is soarranged that the paper must rest on the ledge I08 in such position asto block the light through both apertures at the same time, whichresults in the paper being properly aligned for writing purposes.

Drive of feed roller The feed roller is driven by a friction drive fromroller 26. The arm I8I is pivoted at I34'on the axis of roller 26 andhas 'an extension carrying the armature I,35 to be attracted by themagnet .I36, secured by bracket I31 to the frame 25. When this magnet isenergized, the arm I3I is moved towards the platen I3 so that thefriction roller I28 is brought into engagement with 26 and I3 andthesliding motion of plate I30 enables the frictional engagement to beequalized I between these rollers. When magnet I36 is deenergized,spring I36 moves the arm. 3I away "from the platen and immediatelydisengages the friction drive. It will thus be noted that when magnetI36 is energized the rotation imparted to the roller I3 iscorrespondingly imparted to roller 26 and when I36 is deenergized, whichcondition always prevails during the writing period, the friction rollerI28 is held free from the platen and thus avoids any interference withthe movement-of the carriage. The magnet I36 may be controlled by a discI36, rotating with the roller 26 and the contact-fingers I40 and I whichare more particularly described in connection with .the operatingcircuits.

The paper lift In Figs. 12 and 13 the continuous running belt 3| drivesthe main shaft 33 with the roller I66 and the conveyor belts I16 andI11. Magnet I5I, mounted on frame 2I, has an armature I52,

pivoted at I52a and normally held in the deenergized position by springI53.. When this magnet is energized the armature I52 moves the clutchI54 on the shaft 33 which is splined at I55, to engage the clutch memberI51, of pully I510, and by the crossed belt I58 and pully I59 rotatesthe paper lift drum 31. One side of this drum I60 is provided with thecam I6I which has a depression at I62. A'roller I63 engages cam IGI andis carried by the lever frame I64 which is pivoted at I65, has a rollerI66 resting upon the inner end of the pile of paper 38 so that as thepile is used up this roller follows the paper and lowers the roller I63supporting the drum 31 so that the drum by gravity, swinging on the arm36 through the are indicated by. -11, follows the paper in the tray andautomatically adjusts itself to the quantity of paper in the tray. Thepres sure on roller I63 and roller I66 can be regulated by the counterweight I12, mounted on arm I1I, attached to frame 36 and arranged tocounter balance part of the weight of the drum 31'.

The drum 31 is provided with bladesat I63 and I10 which may be used tocreate an air circulation through the paper as the machine is in use.

The drum has provided thereon a pair of spaced vacuum cups I61 and I68,Fig. 13, which are aligned with the depression I62 of the drum sothatwhen this depression registers with the roller I63 these vacuum cupsare, by gravity, forced into engagement with the top sheet of the paperpile and by the suction in the cups the top sheet is lifted from belowthe roller I66 and carried forward between the Jaws I13 and I14 to theconveyor belt I16 on roller I15 and below roller I18, mounted in thebracket I18 attached to frame 36. The position of a paper sheet beingtaken up is indicated in dotted outline in Fig. 12 at I in which thevacuum cup I61a has moved forward the sheet to the delivery position. Asshown in the illustration, the take-up drum 31 has one set of vacuumcups and makes one delivery for each revolution. Its revolution iscontrolled by disc I80 and the contact finger I8I which controls magnetI5I as defined in the operating circuits.

The Ventu'ri suction mi It is common practice in printing machines toprovide a suction for taking up the top sheet of a pile of paper and toprovide an air blast to play on the pile to prevent the sheets fromadhering to each other. An arrangement of this kind can be used with thepresent invention but for ordinary purposes a suction created by aVenturi 'nozzle is preferred. Instead of providing a compressor and asuction pump to operate the system, the Venturi nozzle enables theentire system to be operated by an air blast from a blower which iscomparatively inexpensive. The air blast is operated through a pair ofVenturi nozzles to create the suction for lifting the paper and then theair is discharged on the paper pile for the through valve I85 with thehollow shaft I80 upon which the drum 91 is mounted. -This shaft isprovided with a Venturi nozzle as indicated at I9I and which connects bypipe I92 with the vacuum cup I91. A second Venturi nozzle I 99 connectsby pipe I94 with thevacuum cup I99.

The air is discharged from pipe. I90 through the opening I99, connectingwith the annular chamber I91 in the collar I 99 which connects to pipeI81 andwhich discharges the air against the paper pile 98 as indicatedin Fig. 12. As long as a stream of air is maintained in pipe I90 asuction is maintained at I91 and I99 which lifts the paper and moves itforward as the drum is rotated. As soon as the air stream ceases the airstream.

In the alternative construction shown in Fig.

16 the shaft I90a of the drum 91 is not made hollow as in Fig. 14,-instead the vacuum cups 202 and 209 are connected by tubing indicated at20I,'with a collar 200 rotating with the drum 91. A second collar I99,secured. to the frame 99 is provided with an aperture at I99, which inone position opens the tube 20I to atmosphere,

but in all other positions of rotation the tube is closed. The cups 202and209 are made of soft rubber and connect with the tube 20I. When thedrum is lowered by the depression I92 of cam I9I, these cups are forcedinto engagement with the paper, thereby creating a partial vacuumaccording to the well known'rubber vacuum cups;

' this vacuum lifts a sheet of the paper and as soon as the deliveryposition is reached the vacuum is released at I99. The tube 20I is madeas small as possible sees not to materially iniluence the vacuum createdin the vacuum cups.

Elevating the paper tray In the arrangement shown in Fig. 12, the takeupmechanism is shown as beingself-adjusting relative to the height of thepaper in the paper tray which rests on the fixed support or table II,Fig. 1. In some cases it is desirable, either with this self-adjustingsystem or without the selfadjusting feature, to provide a mechanism thatwill automatically elevate the paper in the paper tray as it isused up;.the arrangement in Figs. 1'1 and 18 is provided for this purpose. Thiscomprises a paper tray 99a. in which the paper pile 99 is placed. A post205, rising from the bottom of the tray pivotally supports the lever 209with the cross bar 201 resting upon the paper, so that by gravity thelever 209 is lowered as the paper is removed from below the bar 201. Astand 209, through the slot 209, supports a light bulb 2I0, winch islinked to the lever 209 at 2I I. This has the effect of moving the lightbulb 2I9 vertically in the slot 209 as the paper is removed from thetray. n the opposite side of the tray anaperture 204 is provided in thewall and opposite this aperture, on a fixed stand 2 I9; is provided thelight cell 2I2 which is directly opposite the light bulb 2I0 when thepaper is at normal it is comparatively light it readily releases thesheets as they are taken off.

The light cell 2I2, through the amphfier 2l4 and circuit 2 I 5,energizes relay 2 I 9 when the light from the bulb 2I0 falls upon thecell. When relay 2.I9 is energized. circuit is established from thesource of energy B through contact 2I1 and circuit 2! to motor 2 I9. Themotor 2I9, through the worm 220, and worm wheel 22I, supported on 222,and threaded. on stem 229, raises the tray 99a, which is guided in itsvertical movement by the slide 224, engaging the fixed arm 225. It willbe seen that when the paper 98 is below normal and permits the lightfrom 2) to energize 2I2, the motor operates to raise the paper trayuntil the light is shut oil. When this occurs the circuit isinterrupted, relay 2I9 is deenergized and the tray makes no furthermovement until the paper is again reduced below the normal height whenthe operation is repeated and in this way the level of the paper ismaintained for operating conditions.

Auxiliary roller drive I The driving mechanism for the platen of the.

typewriter may be obtained through an auxiliary roller which can bemounted in the place of the feed 'roller and arranged by a frictiondrive to cause rotation of ,the platen as desired. An arrangement ofthis kind with finger stops for the paper sheet and the control thereforis illustrated in'-Figs. 19, 20 and 21. The auxiliary roller 290,through the friction wheel I28, drives the platen I9. which iscontrolled by the magnet I99 as in Fig. 3. The mechanism which rotatesshaft 52 is coupled to shaft 29a of roller 290 so that this roller iscontrolled in the same way as the platen roller is controlled in Fig. 3.A rod 29I, mounted at the back of the roller 290, carries the arm 292with the roller 299, also the arm 294 with the roller 295. Therollers-299 and 295 are controlled by the armature 299 which isattracted by magnet 291 tobring the rollers into engagement with thepaper sheet I05. Whenthe magnet 291 is deenergized the rollers are movedaway from the auxiliary roller 290 by the spring 299.

an arm 242 with the stop stud 249 and a second arm 244, spaced from thefirst arm, with the stop stud 245. The sleeve 24I has an armature lever2'49 connected by a stem-241a with the armature 249 which is attractedby the magnet 241 when this magnet is'energized. Spring 249 brings thestop studs 249 and 245 into position to stop the paper sheet. I05 and tohold the sheet in this position until these studs are withdrawn, whichoccurs when the'magnet' 241 attracts the armatwo 249.

The electrical operation of this apparatus will be understood from thecircuits shown in the drawings from which it will be noted that magnetI99 is energized through circuit 9I3a in series with magnet 19 or'magnet11. Since magnets 19 and." are energized to operate the clutches of the290 and the platen I9, and causing rotation of the platen I9 incorrespondence with the rotation se cured in Fig. 3. In this arrangementthe drive is made to the mechanism which is stationary relative to thecarriage movement of the platen and a splined shaft is not required.

Magnet 291 is controlled by circuit 25I through contact finger 259 whenrelay S is energized and through contact 252 when relay P. is energized,

' 4 A sleeve 2" is mounted on rod 29I and carries and magnet 241 isenergized through circuit 254,

including contact 255, when relay D is energized,

contact 256 when relay P is energized, and contact 251 when relay S isenergized. Thus the op-, erating circuit of magnet 231 is established inmultiple by relays S and P and the operating circuit of magnet 24'! isestablished in multiple by relays S, P and D. In order to deenergizemagnet 241 to permit the stops 243, 245 to stop the paper before thecycle of operation is completed the circuit through contact 255 iscontinued through line 254a, to contact fingers 26I on disc The fingersare bridged by band 262 which interrupts the current before the cycle iscompleted.

The relay P when energized causes the primary, or first, movement oftheplaten'to position the paper for the first writing operation and atthe same time it energizes magnet 23'! to cause the rollers 233 and 235to clamp the paper against theauxiliary roller 230 and thereby deliverthe paper to the platen. If a second writing position is to beestablished, the relay S is energized for this purpose which againestablishes the circuit of magnet 231, thereby delivering the paperfurther to the platen. If, however, the platen is provided with theusual feed rollers, this second energizing of the magnet 23! by relay Swill not be necessary.

The stop studs 243 and 245 stand normally in position to stop the sheetof paper from reaching the platen by the action of spring 249. However,when the paper stock is to move forward, these fingers must be moved outof the way to permit the rollers to act upon the paper. As the paper ismoving onto the platen when relays P and S are energized and also whenrelay D is energized,

which relay is energized when the paper is discharged from the platen,the magnet 24! is energized to remove the stop fingers under theseconditions. The rollers 233 and 235 engage the paper above the fingers.the instant that the stops release the paper and cause its forwardmovement to the platen. The control of relays S, P and D will bedescribed in connection with the op erating circuits.

The operating circuits The synchronous operation of the various'partsmaking up the system will be understood from the operating circuits asillustrated in the diagram in Fig. 22. The control is shown by one sideof the circuit only, starting at a source of energy usually indicated byB and the return circuit is indicated by an arrow point. in this diagramrelay P controls the circuit of the clutch magnet I3'until the platenhas made a predein. this position, the final movement of the steppingwheel 84 energizes relay D to complete the cycle of operation asdetermined by the controlling ring 8|. When relay P is energized magnetI3li is energized to cause one-half turn of the feed roller 26 and whenrelay D is energized the feed roller completes its revolution and magnetII is energized to operate the paper lifting drum.

Relay P'is energized through wire 30I by means hereafter to. bedescribed. This is a stick relay controlling its own circuitthroughcontact 302, wire 303, wire 304 and contact fingers 305 and 306 bridgedby band 301 on disc 90, which is rotated by the shaft 52. Finger 306connects by wire 308 to contact finger 300 of relay P and to energy B.Wire 3I0 connects to wire 304 and is controlled by contact 3I I, held inthe closed position by armature "I8 when magnet 11 is deenergized, andthe circuit continues by wire 3I2 to magnet "I3 and to the returncircuit on wire 3I3.

-This engages clutch 69 and rotates the platen until the band 301,moving in the direction of the arrow, moves'from under the contactfinger 306 and thus opens the circuit from the contact finger 309 towire 3I0, thereby deenergizing magnet 73 and it also opens the holdingcircuit on wire 303, causing relay P' to deenergize. The discs 88 and 90engage an arbor 404, splined on shaft 52, through a disc spring 403,which enables these discs to be adjusted relative to the shaft 52. The

point at which the band 30'! opens the circuit to 306 is the point wherethe first line in the writing operation begins and the disc is adjustedfor this position on a graduated scale. A micrometer adjustment may beobtained supplementary to the adjustment of disc 90 by the screw 402adjusting the position of the block 40I carrying the contact fingers. Asimilar adjustment is obtained for the block at 405 by thelscrew 406,carrying the contact fingers engaging the disc 88.

When the relay P- is energized a circuit is established through contactfinger 3II, wire 3I8, contact finger 353 of detector relay 354deenergized, wire 360 to contact finger 3I9, contact 3I9a on band 320,contact finger 32I and wire 322a to magnet I36. This sets up thefrictional drive for the feed roller 26"from the platen I3 to move thepaper forward to the platen. The contact finger 3I9 maintains thecircuit at 3I9a until the insulation 322 is moved by the disc and theband 320 engages the fingers 32I and 32Ia. The energy for maintainingmagnet I 36 energized is obtained through contact finger 32Ia untilone-half revolutio'n is made and the band 320 is moved from below thecontact finger 32I. In this position the feed roller is stopped clear ofthe paper that .is being fed to the platen as in Fig. 9.

Relay S is energized through wire 323 by means hereafter to be describedand closes a holding circuit through contact 324, to wire 325 whichconnects to wire 3I0 and energizes magnet 13. An energy circuit isestablished from energy B through contact 329 of relay S to wire 328 anda circuit is established from this wire across the contact fingers 33Iby the band 328a until thisband, which is mounted on disc 88, movesaround to disengage one of the contact fingers and open the circuit.When the circuit is open, clutch magnet I3 is deenergized and theholding circuit of relay S is deenergized. It will be noted that theholding circuit of relay S and the circuit on wire 3! for magnet 13 ismaintained through the contact fingers 33I until the second movement ofthe platen has been completed. The extent of this movement is determinedby the adjustment of disc 80 to position the contact band 328a so as toopen the circuit of magnet 13 -at the correct place for beginning thewriting in the second position.

Relay' D is energized by wire 335 in a manner hereafter to be describedand closes a holding circuit through contact 336 to wire 331, contactwire 3I3.

fingers 339 on disc 93, bridged by contact band 96 and by wire 3 tocontact 342 of relay D to energy. Wire 343 connects to wire 331 and tothe circuit controller 344, closed by armature 14 of magnet 13 in thedeenergized position, to wire 345, magnet 11 and to the return circuiton This engages the'clutch 1| to rotate the controlling ring 8| in thedirection of the arrow until the insulated section .91 insulates one ofthe contact fingers 339 and opens the circuit which deenergizes theclutch magnet 11, and deenergizes the holding circuit of relay D andrestores the system to the starting position.

It will be noted that the circuit of the clutch magnet 13 is controlledby the clutch magnet 11' and the circuit of clutch magnet 11 iscontrolled by magnet 13 so that both of these magnets cannot beenergized at the same time. In the rotation of the platen as controlledby discs 99 and 99 a corresponding rotation is applied to ring 8|,making a partial turn from the zero or starting position. When relay Dis energized the ring 9| is rotated to complete the cycle of operationand to restore the apparatus to the starting position for anotheroperation.

When relay D is energized a circuit is established through contactfinger 35I and wire 356, to contact finger 351, engaging the disc I39.This contact finger 351 engages only the projection 359 of band 353which has been moved under this contact finger by the previous hali'revolution of the feed roller 26. This, continues a circuit through band359, contact finger 32I and wire 322a to magnet I36, which brings thefrictional drive of the platen, as rotated by the en-.-

gagement of clutch H to rotate the roller 26 for the second halfrevolution, thus restoring this roller to where the ledge I99, Fig. 8,is in position to engage the next sheet oi paper. The roller 26 makestwo half turns in one cycle oi! operation of the mechanism.

The detector relay 354 is operated by circuit 36 I, controlled by thelight valve or photo electric cell I25 and amplifier 362 andby a secondlight valve I25 and amplifier 363 to the energy wire B. The relay iscontrolled in multiple circuit by both of the light valves so thatunless the paper sheet I95 shuts oil the light through both the openingsI22 and I23, relay 354 will be held energized and the circuit for theoperation of magnet I36 by relay P will be interrupted until the paperis properly adjusted, that is, the paper will not be tating the platenat the reduced speed until a new sheet of paper is located in the.writing position. If automatic repeating is not required, the switch 349is connected to the manually operated push button 350 by which theoperator circuit to energize relay P. i The line control The automaticcontrol obtained by the numberof lines that are to be written may beadjusted to operate for a different nu'mberot lines at each writingposition and with any line spacing desired, for instance, in the firstwriting establishes the position the control may not become eifectiveuntil three lines have been written, after which the platen is operatedto place the paper in the second writing position, and in this positionone line only may be all that is needed, after which conditionsprevailing at one writing location tothe new conditions prevailing atthe next writing location. The'writing positions are set upautomatically but the line spacing is manually operated at eachposition.

The wheel 94 is provided with three rows of contacts, Ia, Ib, Ic, whichengage the contact finger 369, the outer row Ia has a contact for eachstep of the wheel, the second row Ib has a contact for each second stepof the wheel and the third row ie has a contact for each third step ofthe wheel. The first row connects by wire 3" to contact 312 of thechange-over relay C. The second row connects by wire 313 to contact 314and the third or innerrow connects by wire 315 to contact 316. When thechangeover relay 0 is deenergized these wires are in circuit with agroup of switches 311, marked a, b and c, and when the relay C isenergized these wires connect to another group of switches 319, markeda, b and c. When C is deenergized and switch 311a is closed the outerrow of contacts are in circuit and when switch 3110 is closed the innerrow oi contacts are in circuit. When relay C is energized and switch318a is closed the outer row of. contacts are in circuit, when switch3191; is closed the second row of contacts are in circuit andwhen319c-is closed the inner rows are in circuit. The switches 311 and 319connect to the wire 425 which receives energy through contact 426 whenmagnet 394 is deenergized. i

' The contact finger 369, by wire 316, connects to relay T and when itengages anv energized contact, relay T is energized; at other timesrelay T is deenergized. When relay C is deenergized, switch 393'closedand switch 392 open, a circuit is established through contact 394 ofrelay T, wire 395, contact 396 of relay 0, switch 399. wire 391.contact399 oi. relay S deenergized, and wire 335 to energizerelay D forcompleting the cycle of operation. when relay T is energized and relay Cis energized, the previous circuit is interrupted at 396 and anothercircuit is established on'wires 332 and 323 to energize relay S for thesecond movement of the platen;

When the system is to opera-teto a second writing position the switch398 is opened and the switch 382 is closed so that when the relay T isenergized a circuit is established through contact .390, wire 39| andswitch 392 to pick-up relay C; and a holding circuit is established forthis relay through contact 393 and wire' 3| 6 to contact fingers 3i 4which are bridged by the contact band 3I5 on disc 99 in the secondposition so that when relay C is thus energized it remains energized andchanges over the system. A circuit is established at the same time fromwire 395, through contact 396, wire 332, wire 323 to energize relay S.After relay S is energized it operates the platen according to theposition of disc 99, but once the circuit is interrupted at contactfingers 33I there is no further movement of the platen even ii relay-Sshould afterwards he energized.

The number of lines to be written in the first location being known, acorresponding switch a,

b or c of the group 311 is closed, say switch,o.

is closed and the other switches are open, then the first line iswritten without any change in the carriage, but in returning thecarriage to write the second line the wheel 94 is moved one step, and inreturning the carriage after writing the second line, wheel 94 is movedthe second step, and in returning the carriage afterwritting the thirdand last line, the wheel 94 is moved energized.

If a second writing position is required, say of two lines, then switchI) of group 318 is closed while the other switches remain open andswitch 332 is closed and switch 388 is opened. 'In this position, assoon as the carriage has been restored at the end of the first writing,relay T is energized which energizes relay C and the contact band M ondisc 90 being now positioned to bridge the contact fingers 3, thecircuit is established through wire M6 to hold relay C in the energizedposition for the remainder of the operation. Thus, in the firstoperation, relay C remains deenergized and establishes a line control bythe switches in group 311 until the first writing is completed. Thefinal movement of the carriage energizes the change-over relay for thenew condition of writing at the next location.

When relay T is energized again after the second writing operation acircuit is established through 384 and 386 to energize relay S but thiscircuit does not affect the movement of the platen as it is interruptedat the contact fingers 33! which have rotated the platen to disengagetheband 328a from 331 and to bridge the contacts 321 by the band 330. Inthis second writing position, therefore, with relay C energized, thecircuit is established by relay T energized through contact 3", wire385, contact 386, wire 332. wire 323, contact fingers 321, wire 33,contact 390 of relay 8, which is now energized by wire 323, to wire 335at the second locations are the same, the system will automaticallyadjust itself for repeating operations; but, if the number of lines inthe second location are diiferent from those in the first location, thenthe stepping wheel would get out of step in each cycle of operation andin order to prevent this the stepping wheel is automatically restored toa neutral or starting position of which four pomtions are shown in thedrawings. 'Ihisis obtained by the magnets 394 and 394a rotating the fourpole rotor 333 with the poles 398 between these magnets. This rotor ismounted on the axis Ii of the stepping wheel 94 and when the magnets areenergized the poles are rotated into alignment with the magnets. Thesemagnets are controlled by wire 395, and by contact 396 of relay P, bycontact 331 of relay S so that when plied mechanically.

either relays P or S are energized to move the platen to a new writingposition the stepping wheel is synchronized at the same time.

.The paper feed roller operates with the discharge of the paper from theplaten and is con- .trolled by a circuit established through contact illof relay D, wire 2, contact finger 4, projection 3, band 5 on disc I80,to contact finger H9 and wire 4" to the clutch magnet i5l, As soon asthe initial movement of the disc has been made to remove the insulationM6 and bridge fingers H8, M9. by band 5, a circuit is established foroperating the clutch magnet ISI for a single complete revolution.

The restoring apparatus 393 for wheel 94 is intended to complete itsoperation before the platen has completed its movement and deenergizedrelay P or relay S. Should, however, the wheel 94 be restored to theneutral position before the platen movement is completed, it cannotcause improper operation of the system as the energy for relay T is cutofi at 426 during this operation. When restored to the neutral positionfrom which any of the steps may be started, the finger 369 rests betweenthe radial row of contacts on each band, on lines 398a and the nextcontact on the outer row so as to leave the circuit open until the firstmovement of the carriage completes the initial step and connects 369with the next contact on the 'outer row. The teeth engaging roller 91 inthis position are shaped .to permit this movement.

The electric control enables the apparatus to be condensed and the useof stick relays in con trolling the rotation of the platen gives resultsthat would be complicated and involved if ap- It should, however, beunderstood that a system of cams could be used for operating theclutches for the paper take-up and operating the friction drive for thefeed roller. The stop fingers and engaging rollers in Fig. 20 could alsobe operated by a cam movement. It is apparent that the apparatus foreach specific feature may be used in a generic sense as well as in thecombination shown. The paper has been referred toas a sheet of paperwhich is understood to include manifold sheets that are commonly used inmaking several copies on the typewriter.

An application was filed on August 6, 1934, Serial No. 738,609 nowPatent 2,028,813, January 28, 1936, by Robert Stuart, one of theapplicants in the present case, relating to a machine for securing partof the results disclosed in this application by a mechanism that isentirely mechanical in its operation.

Having thus described our invention, we claim:

1. A system for delivering paper sheets from a stack to printingmachines comprising a fixed support for the paper, a conveyor fordelivering the paper, a lifting drum for lifting the sheet from thestack to the conveyor, 9. pivoted frame for said lifting drum and meansregulated by the height of the paper in the stack supporting said drumto follow the paper as it is used and to enable the paper to be taken upby the drum from the entire stack.

2. A system for delivering paper sheets from a stack to printingmachines comprising a lifting device arranged to engage the top sheet ofthe stack and move it forward to the printing machine, a Venturi nozzlemaintaining a suction for said lifting device and a pipe for maintainingan air str am through said Venturi nozzle when the sheet is to be liftedand delivering said air stream upon the paper stack.

a 3. A system for delivering paper sheets from a stack toprintingmachines comprising a lifting device arranged to engage the stopsheet of the printedto said roller, line spacing means, manuallyoperated for said roller, power operated means for automaticallyrotating said roller to position the paper for'printing and poweroperated means for rotating said roller at a higher speed than thepositioning speed to discharge the paper after printing said poweroperated means for discharging the paper controlled by said line spacingmeans. Y s

5. A system for printing comprising a platen roller and means forfeeding the paper to be printed to said roller, line spacing meansforsaid roller, power operated means for automatically rotating said rollertoa plurality of printing positions of the paper independently of saidline spacing means, and power operated means for rotating said roller ata higher speed than the positioning speed to discharge the paper afterprinting. v

6. A system for printing comprising a platen roller, a line spacer andmeans for feeding the paper to be printed to said roller, meanscontrolled by the rotation of said roller for automatically rotatingsaid roller to position the paper for printing and means controlled bythe line spacer for automatically rotating said roller to change thepaper to a new writing position after a predetermined number of lineshave been written.

'7. A system for printing comprising a platen roller, a line spacer andmeans for feeding the paper to be printed to said roller, meanscontrolled by the rotation of said roller for automatically positioningthe paper for writing a predetermined number of lines at a firstlocation,

means for automaticallyrotating said roller to change the writingposition of the paper for writing a predetermined number of lines at asecond location and means controlled by the line spacer for dischargingthe paper from the machine after the number of lines at the secondlocation are completed.

8. A system for printing comprising a platen roller and means forfeeding the paper to be printed to said roller, means controlled by therw tation of said roller for rotatingsaid roller for a cycle ofoperation, additional means controlled by the rotation of said rollerfor rotating said' roller to position the paper in a predeterminedprinting position within the cycle of operation and means for completingthe cycle'of operation after a predetermined number of lines have beenwritten.

9. A system for printing comprising a; platen roller and a feedrollerifor feeding paper to the platen roller to be printed, a ledge onsaid feed roller for positioning the" paper, a cam-on said feed rollerengaging the paper for feeding purposes and means for rotating said feedroller a first time to feed the paper and rotating said roller a secondtime to position the paperifor each sheet of paper fed to the platen.

10. A system for printing comprising-wplaten I roller and a feed rollerfor feeding paper to the platen roller to be printed, a ledge on saidfeed roller for positioning the paper, a cam on said feed rollerengaging the paper for feeding purposes, and means connecting saidroller with said platen for intermittently rotating said roller to feedthe paper to the platen and to position the paper before feeding to theplaten.

11. In a printing system, a platen roller, means for feeding paper tosaid platen roller to be printed and means for aligning said paper withsaid platen comprising a pair of spaced light sensitive cells placed inthe path of an edge of the paper when in the aligned position and meansfor preventing the operation of the feeding means when either, or both,of said light cells are ing a conveyor, a paper tray for a stack ofpaper,

means for taking up said paper ,one sheet at a time and placing saidsheet on the conveyor, motor operated means for elevating said tray, a

'light bulb on said tray, means for moving said bulb vertically by thestack of paper, a light cell on a fixed location, said paper stack beinglocated between said light bulb and said light cell to shut oi! thelight when the height of the paper is normal and means for operatingsaid motor to elevate the tray when the light to said cell is not shutoif.

14. A system for delivering and placing paper sheets on the platen of atypewriter in a predetermined position, comprising a paper lift for thesheet, a conveyor receiving the sheet, a feed roller positioning thesheet and delivering it to the platen, means for automatically rotatingthe platen to a plurality of predetermined writing positions for writinga plurality of lines in each position and. means for automaticallyrotating the platen to discharge the paper when the writing iscompleted. I

15. A. system for delivering and placing paper sheets on the platen of atypewriter in apredetermined position comprising a conveyor for thesheet, a feed roller receiving the sheet. from the conveyor, aligningsaid sheet and delivering it to the platen, means initiated by therotation ofv the platen for rotating the platen to position the sheetand means controlling the further rdtation of the platen by the movementof the typewriter mined number of movements of the carriage for rotatingthe platen to a second position and means controlled by a predeterminednumber,

of movements of the typewriter carriage for caus ing further rotation ofthe platen.

17. A system-for rotatingthe platen of a type-' writer to position thepaper thereon, comprising- "a motor, spur of independent'gears ofdifferent gear ratio connecting said motor with the,

,platen, amagnetically operated clutch for each clutches for thepredetermined rotation of said platen by said motor. 5 18. A system forrotating the platen of a typewriter to position the paper thereon,comprising a motor, a gear and a clutch connecting said motor with saidplaten, a line spacer for the platen, a magnet for operating saidclutch, a circuit controller operated by the rotation of said platen anda stickrelay/controlling said clutch, having a holding circuitcontrolled by said circuit controller and having a pick up circuitcontrolled by the line spacer. 19. A system for rotating the platen of atypewriter to position the paper thereon, comprising a circuitcontroller connected to said platen to make a single revolution for aplurality of turns of the platen and a second circuit controllerrotating with said platen, a motor, a gear with a clutch connecting saidmotor with said platen, a second gear and clutch connecting said motorwith said platen, a magnet operating the first clutch and controlled bysaid first named circuit controller and a magnet operating the secondclutch and controlled by the second circuit controller.

20. A system for delivering and placing sheets of paper on the platen ofa typewriter, comprising a paper take-up, a magnetic clutch controllingsaid take-up, a feed roller for delivering the paper to the platen, amagnet controlling the rotation of said feed roller and controlled bysaid feed with said platen through a magnetic clutch and means forcontrolling the operation of said paper a sheet of paper in writingposition on said platen, toremove the sheet when the writing iscompleted and to continue the operation.

21. A mechanism for operating the platen roller of a typewriter with amovable carriage having a shaft for said roller, a motor, a gearmechanism operatively connecting said motor and shaft, a plate fixedrelative to said carriage, means for detachably securing said mechanismto said plate, and means including a spline operatively connect ing saidshaft with said mechanism. a

22. A mechanism for operating the platen roller of a typewritercomprising a shaft for said roller, a motor, a gear mechanism havinggears of different ratio, a flexible shaft operatively connecting saidmotor with said mechanism, means shaft to rotate said shaft by saidgears at different speeds. relative to the speed of said motor effectivegear ratio of said mechanism.

23. A mechanism for operating the platen' roller of a typewritercomprising a shaft for said roller, 8. motor, a gear mechanism, a driveshaft in said mechanism operated by said motor, a gear on said rollershaft, a pair of gears of different gear ratio connecting said driveshaft with said roller shaft and means for selectively making either ofsaid gears effective at a time to drive said platen shaft from saiddrive shaft.

24. A mechanism for operating the platenroller of a typewritercomprising a shaft for said roller, a motor, a gear mechanism, a'driveshaft in said mechanism operated by said motor, a gear on said rollershaft, a pair of gears of different gear ratio connected with'saidroller shaft and a clutch for each gear operatively connecting the gearwith the drive shaft.

of said gears and means for operating said a roller, a motor, a gearconnectingsaid motor' take-up, said feed roller and said platen to placeoperatively connecting said mechanism with said and electricallyoperated means for selecting the 25. A mechanism for operating theplaten roller of a typewriter mounted on a carriage with a shaft forsaid roller, a mechanism separate from the typewriter comprising amotor, a gear mechanism, a drive shaft operated by a motor, meansincluding a clutch connecting said drive shaft with said roller shaft,and a magnet controlling said clutch, a disc operatively connected withsaid roller shaft to rotate at a lower speed than said roller shaft anda circuit controlling member engaging said disc and controlling thecircuit of the magnet,

26. A mechanism for operating the platen rollerof a typewriter mountedon a carriage havingya shaft for said roller, a mechanism separated fromthe typewriter comprising a motor, a gear mechanism, a drive shaft insaid mechanism operated by said motor, means including a clutchconnecting said drive shaft with said roller shaft, a magnet controllingsaid clutch, a pair of discs operatively connected with said rollershaft to rotate with said shaft and circuit controlling members engagingsaid discs and controlling the circuit of said magnet.

27. A mechanism for operating the platen roller of a typewritercomprising a shaft for said roller, a motor, a gear mechanism, a driveshaft in said mechanism operated by said motor, means including a pairof clutches operatively connecting said drive shaft with said rollershaft, a magnet for each clutch controlling the clutch, a discoperatively connected with 'said roller shaft, a contact member carriedby said disc and contact fingers engaging said contact member andarranged with the disc in one position to control a circuit to energizeone of said clutch magnets and to control another circuit to deenergizethe other clutch magnet.

28. A mechanism for operating the platen roller of a typewritercomprising a shaft for said roller, a motor, a gear mechanism, a driveshaft in said mechanism operated by said motor, means including a pairof clutches operatively connecting said drive shaft with said rollershaft, a magnet for each clutch controlling the clutch, a discoperatively connected with said roller shaft to rotate at a lower speedthan said roller shaft, a contact member carried by said disc andcontact fingers engaging said contact member and con trolling a circuitto energize one of said clutch magnets until said disc has completed arevolution and closing a circuit to energize the other clutch magnetwhen said disc has completed the revolution.

i 29. A'mechanism for operating the platen roller of a typewriter havinga carriage with a shaft for said roller, a drive mechanism comprising amotor, a gear mechanism, a drive shaft insaid mechanism operated by saidmotor, means including a clutch connecting said drive shaft with saidroller shaft, and a magnet controlling said clutch, a disc operativelyconnected to rotate with said'platen, means for manually adjusting theposition of said disc and a circuit controlling member engaging saiddisc and controlling the circuit of said magnet.

30. A mechanism for operating the platen roller of a typewriter having acarriage with a shaft for said roller, a drive mechanism comprising amotor, a gear mechanism, a drive shaft in said mechanism operated bysaid motor, means including a clutch connecting said drive shaft withsaid roller shaft, and a magnet controlling said clutch, a pair of discsoperatively connected to rotate with said platen, means for manuallyadsaid mechanism operated by said motor, means ineluding a clutchconnecting said drive shaftwith said roller shaft, a magnet controllingsaid clutch, a pair of discs operatively connected to rotate with saidplaten, means for manually adjusting the position of said discs relativeto each other, a circuit controlling member carried by one disc forcontrolling the circuit of said magnet to rotate the platen to a firstposition and a circuit controlling member carried by the other disccontrolling the cir uit of said magnet to rotate the platen to a s endposition.

32. A mechanism for operating the platen roller of a typewritercomprising a shaft for said roller, a motor, a gear mechanism, a driveshaft in said mechanism operated by said motor, means including a firstclutch operated by a magnet connecting said drive with said rollershaft, means including a second clutch operated by a second magnetconnecting said drive with said roller shaft, a first disc connected torotate with said platen, means for manually adjusting the position ofsaid disc, a second disc connected to rotate with said platen, a circuitcontrolling member carried by said first disc controlling the circuit ofsaid first magnet and a circuit controlling member carried by saidsecond disc controlling the circuit of said second magnet.

33. A mechanism for operating the platen roller of a typewritercomprising a shaft for said roller, a motor, a gear mechanism, a driveshaft in said mechanism operated by said motor, means including a firstclutch operated by a magnet connecting said drive with saidroller shaft,means including a second clutch operated by a second magnet connectingsaid drive with said roller shaft, a first disc connected to rotate withsaid platen, means for manually adjusting the position of said disc, 9.second disc connected to rotate with said-platen, a circuit controllingmember carried by the first disc controlling the circuit of said firstmagnet to rotate the platen from a starting position a predetermined distance and a circuit controlling member carried by said second disccontrolling the circuit of the second magnet to rotatethe platen to thestarting position.

34. A mechanism for operating the platen roller of a typewritercomprising a shaft for said including a first clutch operated by amagnet connecting said drive, with said roller shaft,

means including a second clutch operated by a second magnet connectingsaid drive with said roller shaft, a first disc connected to rotate withsaid platen, means for manually adjusting the position of said disc, 9.second disc connected to rotate with said platen but at a slower speedthan said platen, a circuit controlling member carried by the first disccontrolling the circuit of said first magnet to rotate the platen from astarting position a predetermined distance and a circuit controllingmember carried by said second disc controlling the circuit of the secondmagnet to restore the platen to the starting position.

35. A mechanism for operating the platen roller of a typewritercomprising a shaft for said roller, 9. motor, a gear mechanism, a driveshaft in said mechanism operated by said motor, means including a clutchoperated by a magnet connecting said drive with said roller shaft, a

carriage for said platen, a circuit controller op-' erated by themovement of said carriage in its extreme position and a circuitcontrolled by said circuit controller to energize said magnet to movesaid roller to a new position.

36. A mechanism for operating the platen roll er of a typewritercomprising a shaft for said roller, a motor, a gear mechanism, a driveshaft in said mechanism operated by said motor, means including a.clutch operated by a magnet connecting said drive with said rollershaft, a carriage for said platen, a'stepping circuit controlleroperated by the movement of said carriage and a circuit established by apredetermined number of movements of said carriage through said circuitcontroller to energize said magnet to move said roller to a newposition.-

37. A mechanism for operating the platen roller of a typewritercomprising a shaft for. said roller, a motor, a gear mechanism, a driveshaft in said mechanism operated by said motor, means including a clutchoperated by a magnet connecting said drive with said roller shaft, acarriage for said platen, a stepping circuit controller operated by themovement of said carriage, means for establishing the circuit of saidmagnet after a predetermined number of movements of said carriage tomove .said roller to a first position and means for establishing anothercircuit by said stepping circuit controller after a predetermined numberof movements of the carriage with the roller in the first position tofurther move said roller.

38. A mechanism for operating the platen rollof movements of saidcarriage and said circuit controller operating said controlling means torotate the roller to anew position. r I

39. A mechanism for operating the platen roller of a typewriter mountedon a carriage for letter spacing movements comprising a motor operatedmechanism for rotating [said roller, means controlling the operation ofsaid mechanism, a circuit controller adjusted to operate bya'predetermined number of movements of said carriage in one directionand said circuit controller operating said controlling means to rotatesaid roller to.a first position and by a predetermined number ofmovements of said carriage when the platen is in the first positionoperating said controlling means to rotate the roller to a secondposition.

40. A mechanism-for operating the platen roller of a typewriter mountedon a carriage for right and left movement comprising a motor operatedmechanism for rotating said roller,

means controlling the operation of said mechanism, a circuit controlleradjusted to operate by a predetermined number of movements of saidcarriage in one direction, said circuit controller operating said meansto rotate said roller to the starting position.

engages the paper resting on the stop and delivers it to the platenroller.

42. A mechanism for feeding paper to a typewriter platen comprising afeed roller and a platen roller located parallel to each other, meansconnecting the feed roller with the platen roller for intermittentlyrotating the feed roller with the platen and a cam on said feed rollerengaging the paper to feed it to the platen and releasing the paperafter the feed roller has made a predetermined movement.

43. A mechanism for feeding paper to a typewriter platen comprising afeed roller and a platen roller located parallel to each other, meansconnecting the feed roller with the platen roller for intermittentlyrotating the feed roller with .cam and a second cam operated by the feedroller for bringing said clamping roller into the clamping position.

44. A mechanism for feeding paper to a typewriter platen comprising afeed roller and a platen roller spaced in parallel relation, a frictionroller engaging said platen roller and feed roller for rotating the feedroller to feed paper to the platen roller, a magnet for bringing saidfriction roller into engagement with said platen and feed rollers andmeans operated by the rotation of said feed roller controlling saidmagnet.

45. A mechanism for feeding paper to a typewriter platen comprisingafeed roller and a platen roller, said feed roller feeclini. P per tosaid platen roller, a friction roller engaging said platen and feedrollers, a magnet for bringing said friction roller into operativeengagement with said platen and feed rollers and a circuit controlleroperated by the rotation of said platen roller controlling the circuitof said magnet.

46. A mechanism for feeding paper to a typewriter platen comprising afeed roller and a platen roller located in parallel relation, a paperguide for sheets of paper to pass a sheet under said feed roller, aroundsaid platen roller on the opposite side from the feed roller anddischarge roller and friction means connecting the opposing faces ofsaid rollers to rotate one roller by the rotation of the other.

. 4'1. A mechanism for feeding paper to a typewriter platen comprising afeed roller and a platen roller located in parallel relation, a paperguide for sheets of paper to pass a sheet under said feed roller, aroundsaid platen roller on the opposite side from the feed roller anddischarge over the feed roller, a carriage for said platen roller movingit ,longitudinally relative to the feed roller, a friction rollernormally held clear of said platen roller and means for-bringing saidfriction roller into engagement with said platen roller and said feedroller to feed the paper to the platen roller.

48. A mechanism for feeding paper to a typewriter platen comprising afeed roller and a platen roller, said feed roller feeding the paper tothe platen roller, means for automatically rotating said platen rollerto place the paper in the writing position and means connected with theplaten for rotating said feed roller for an initial movement, means forautomatically discharging the paper from said platen and means connectedwith the platen for rotating the feed roller to the starting position asthe paper is discharged from the platen.

49. A mechanism for feeding paper sheets to a platen comprising a feedroller for feeding the paper to the platen, stop means for holding thepaper sheet in alignment on the feed roller, a light bulb, on one sideof said feed roller, a light valve on the opposite side of said feedroller illuminated from said bulb through an aperture in said roller,said paper sheet intercepting said illumination when engaging said stopsand means controlling the rotation of said feed roller by said lightvalve.

50. A mechanism for feeding paper sheets to a platen comprising a feedroller for feeding the paper to the platen, stop means for holding thepaper sheet in alignment on the feed roller, a pair of spaced lightbulbs on one side of said feed roller, a light valve opposite each ofsaid bulbs and illuminated from said bulbs through apertures in saidroller, said paper sheet intercepting said illumination when engagingsaid stops and means controlling the rotation of said feed roller bysaid light valves.

51. A mechanism for feeding paper sheets to a platen comprising a feedroller for feeding the paper to the platen stops for holding the paperin alignment on the feed roller, means including a magnet operativeiyconnecting said feed roller with said platen to rotate the feed roller,a plurality of spaced light valves, means for illuminating said valves,means for shutting off said illumination by the paper sheet when inaligned position and means controlling the circuit of said magnet inparallel by said light valves.

52. A paper feeding mechanism for feedin from a stack of paper on afixed support, com prising a pivoted frame, a rotating wheel mounted. onsaid frame above and clear of said paper stack. means for rotating saidwheel, means for lowering said wheel to engage said paper in apredetermined position and suction means carried by said wheel engagingsaid paper to lift the top sheet of paper and carry it forward by themovement of the wheel.

53. A paper feeding mechanism for feeding from a stack of paper on afixed support, comprising a pivoted frame, a rotating wheel mounted onsaid frame above and normally clear of said paper stack, a fan carriedby said wheel for circulating air over the paper, suction means carriedby said wheel and a cam for lowering said wheel to bring said suctionmeans into engagement with the top sheet of said stack.

54. A paper feeding mechanism for feeding from a stack of paper,comprising rotating means intermittently engaging said paper, a pipewith an air stream mounted on said means and discharging the airstreamupon the paper stack, a Venturi nozzle in said pipe and a vacuumpipe connected with said nozzle and engaging said paper. stack.

55. A paper feeding mechanism for feeding from a stack of paper,comprising means intermlttently engaging the top sheet of said stack, apipe with an air stream mounted on said means. means for dischargingsaid air stream on the paper stack, a Venturi nozzle in said pipe and a.vacuum pipe connected with said nozzle and ar ranged to engage the topsheet of the stack, by the movement of said means.

58. A paper feeding and printing mechanism comprising a pair of rollers,one of said rollers being mounted on a carriage and being movablelongitudinally relative to the other, means for rotating one of saidrollers, a friction roller engaging the opposing faces of said rollersso that

